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out-of-the-ordinary Column Dowel arrangement

out-of-the-ordinary Column Dowel arrangement

out-of-the-ordinary Column Dowel arrangement

(OP)
Am inspecting on job right now where a number of the columns have an unusual column dowel arrangement.

At each bent, 3 columns (A, B, and C) support an inverted "T" beam which in turn supports pre-cast pre-stressed bridge segments for a flyover roadway.  In one area several bents in a row feature an "A" column with a non-contact lap between the dowels extending from the ftg and the vertical bars in the column.  

Column is 4'6" x 6' with 26 # 11 bars.  The short side of the column has 5 verts: one in each corner with remaining 3 equal spaced.  However, there are no dowels in the corners or on the 6' sides of the column.  Only the 3 equal spaced verts on the short sides have contact laps with dowels.  The remaining 16 (not 20) dowels are in line long-ways with the 2nd and 4th position dowels.

Both the plan view detail and the cross-section detail show the dowels inset.

Any idea what forces would require this sort of dowel arrangement?
 

RE: out-of-the-ordinary Column Dowel arrangement

Most likely were just derived from the moments required to be taken by analysis. The configuration of the reinforcement appears always from that, and is heavily influenced by the modelization of the structure and assumptions made to ensure its stability. May be a T-C compression at the base of the A frame and bigger moments atop?

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